During my first campaign as the English I fought one battle in the open against them. I hid in the mountains until they attacked. It was at night but they still had two full stacks...how that happened I dont know. Anyways I figured that I would use my bombards from high in the mountains to rain fire on them. But, alas, that was not to happen. Instead they were on the wrong side of the mountain and that successfully nullified my bombards. I had about four units of archers also and they kept coming with thier cavalry and I defeated one full stack before thier second stack arrived at the scene. By then my forces were sadly depleted. I decided it would be better to wait them out. The second force did not get there in time and I won the battle. That was the only time I fought them in the semi-open. I think I lost that campaign due to the constraints of time. But anyways that is my encounter with the Mongols.